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c28762070c
Rewrite the Spectre-v4 mitigation handling code to follow the same approach as that taken by Spectre-v2. For now, report to KVM that the system is vulnerable (by forcing 'ssbd_state' to ARM64_SSBD_UNKNOWN), as this will be cleared up in subsequent steps. Signed-off-by: Will Deacon <will@kernel.org>
33 lines
950 B
C
33 lines
950 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Interface for managing mitigations for Spectre vulnerabilities.
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*
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* Copyright (C) 2020 Google LLC
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* Author: Will Deacon <will@kernel.org>
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*/
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#ifndef __ASM_SPECTRE_H
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#define __ASM_SPECTRE_H
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#include <asm/cpufeature.h>
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/* Watch out, ordering is important here. */
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enum mitigation_state {
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SPECTRE_UNAFFECTED,
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SPECTRE_MITIGATED,
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SPECTRE_VULNERABLE,
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};
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struct task_struct;
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enum mitigation_state arm64_get_spectre_v2_state(void);
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bool has_spectre_v2(const struct arm64_cpu_capabilities *cap, int scope);
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void spectre_v2_enable_mitigation(const struct arm64_cpu_capabilities *__unused);
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enum mitigation_state arm64_get_spectre_v4_state(void);
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bool has_spectre_v4(const struct arm64_cpu_capabilities *cap, int scope);
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void spectre_v4_enable_mitigation(const struct arm64_cpu_capabilities *__unused);
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void spectre_v4_enable_task_mitigation(struct task_struct *tsk);
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#endif /* __ASM_SPECTRE_H */
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